基于主成分分析法综合评价小兴安岭低质林择伐生态改造模式

Comprehensive Evaluation of Ecological Improvement Modes for Low-quality Forests in Xiaoxing'an Mountains by Selective Cutting Based on Principal Component Analysis

针对小兴安岭地区低质林的择伐改造模式,选取土壤理化性质、土壤碳释放和枯落物持水特性3个指标层次,运用主成分分析法综合评价不同改造模式的改造效果。结果表明:不同采伐强度的改造效果,从优到劣的排序为:①采伐强度22%,②采伐强度31%,③采伐强度66%,④采伐强度77%,⑤采伐强度55%,⑥采伐强度47%,⑦采伐强度41%;在实验选择的采伐强度范围内,随采伐强度增加改造效果呈现先减小后增加的趋势,采伐强度22%的改造效果最好,采伐强度41%的改造效果最差。

Principal component analysis was applied to the comprehensive evaluation of ecological improvement modes for low-quality forests in Xiaoxing＇an Mountains area by selective cutting using soil physical and chemical properties,release of soil carbon as well as water-holding capacity of litter as index layers.Results showed that the improvement effect was the best at a cutting intensity of 22%,followed by 31%,66%,77%,55%,47% and 41%.The improvement effect decreased first and then increased with the increase of cutting intensity under the tested intensities.